Delustered artificial silk yarn



Patented Oct. 15, 1935 UNITED STATES PATENT IFFICE' The Viscose Company, Marcus Hook, Pa., a corporation of Pennsylvania No Drawing.

The object of my invention is to produce an improved delustered artificial silk thread or yarn, and more particularly cellulose acetate yarn and this I accomplish by the use of chlorinated naphthalene which is commercially known as halowax. It is a creamy-white wax insoluble in water, but soluble in certain solvents. This ingredient I combine with the cellulose acetate spinning solution by the use of the same solvent as is used to produce the spinning solution of cellulose acetate. In making up a spinning solution for the evaporative process, the cellulose acetate is dissolved as usual in acetone containing approximately 2.5% water. Before this process of solution has been completed, I add to the acetate solution and mix thoroughly with the latter halowax which has been dissolved in acetone, the samesolvent as used for the spinning solution. The amount of halowax is preferably about 12% of the cellulose acetate used, and it is dissolved in aboutthree times its own weight of acetone. These two solutions are thoroughly mixed together, giving a spinning solution in which no solid particles are visible, except. as ordinarily occur in the regular operation. If desired, the required amount of halowax may be dissolved in the whole of the acetone charge before adding 30 the cellulose acetate'or else the halowax and cellulose acetate may be dissolved simultaneously inthetotalacetonechargea Application September 16, 1931, Serial N0. 563,233

2 Claims. (01. 28-1) acetate, because less than 5% chlorinated naphthalene in the yarn does not give an appreciable delustering effect and more than 20% materially weakens the fibers without giving any ap- 1 parent increase in the degree of delustering.

- The resulting product is; an artificial silk thread delustered by having fine particles of chlorinated'naphthalene immersed in and distributed throughout the mass of the thread. 20

I claim as my invention:

L As a new article of manufacture, delustered artificial silk thread having immersed in and distributed throughout its mass material fine particles of chlorinated naphthalene 25 2. As a new article of manufacture, delustered cellulose acetate thread having immersed in and distributed throughout its mass material fine particles of chlorinated naphthalene.

FaiuDERIcK w, KOSTER. 

